I have a PCSPECIALIST Desktop Vortex Computer running Windows 11. It was working perfectly up to a week ago when I came back from a short holiday. I switched it on to find I could not get past the lock-screen. Every time I tried CTRL-ALT-DEL there was no effect. Eventually, I found I could get in by right-clicking the mouse. However I could only access programs by using the mouse, the keyboard had no effect, and I could not even type an eMail. I know the keyboard works because I am using it now on an old machine, (Windows 10).